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#include <stdio.h>
#include <stdlib.h>
#include <cairo.h>
void
randomize_color(cairo_t *cr)
{
double red, green, blue, alpha;
red = (double)rand()/RAND_MAX;
green = (double)rand()/RAND_MAX;
blue = (double)rand()/RAND_MAX;
alpha = (double)rand()/RAND_MAX;
cairo_set_source_rgba (cr, red, green, blue, alpha);
}
int
main(int argc, char *argv[]) {
int i, x, w, prev_w;
cairo_surface_t *surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 800, 80);
cairo_t *cr = cairo_create (surface);
srand(0xdeadbeef);
x = 0;
prev_w = 0;
for (i=0; i<32; i++) {
randomize_color (cr);
w = (32.0*rand())/RAND_MAX + 1;
x += 4 + (prev_w + w)/2.0;
cairo_move_to (cr, x, 10);
cairo_line_to (cr, x, 70);
cairo_set_line_width (cr, w);
cairo_stroke (cr);
prev_w = w;
}
cairo_destroy (cr);
cairo_surface_write_to_png (surface, "hello.png");
cairo_surface_destroy (surface);
return 0;
}
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